AIIMS2019Chemistry-Metals and Non-metals
AIIMS 2019 Chemistry Reactivity of Aluminium MCQ Question
Type: MCQ-conceptual-Medium-Class 11
of aluminium is treated separately with excess of dilute and excess of . The ratio of the volumes of hydrogen evolved is
A
2:3
B
1:1
C
2:1
D
1:2
Correct Answer
Option B
Detailed Explanation
When aluminium reacts with dilute H₂SO₄, it produces 3 moles of H₂ gas for every 2 moles of Al, while the reaction with NaOH yields 3 moles of H₂ for the same 2 moles of Al. Thus, the ratio of hydrogen evolved from both reactions is 3:3, simplifying to 1:1. Therefore, option B (1:2) is incorrect because it misrepresents the stoichiometric relationship; the actual ratio of hydrogen gas produced from both reactions is equal, confirming that the overall ratio is indeed 1:1.
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